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ABSTRACT: Brain tissue reversal mRNA transcriptome analysis in Nile tilapia

PROVIDER: PRJNA999956 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25455100_1.fastq.gz	Fastqsanger.gz
	SRR25455100_2.fastq.gz	Fastqsanger.gz
	SRR25455095_1.fastq.gz	Fastqsanger.gz
	SRR25455095_2.fastq.gz	Fastqsanger.gz
	SRR25455096_1.fastq.gz	Fastqsanger.gz

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Project description:Brain transcriptome analysis of sex reversal in Nile tilapia

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Global DNA methylation changes in Nile tilapia gonad during high-temperature induced masculinization

Project description:In fish, the sex determining mechanisms can broadly be classified as genotypic (GSD), temperature-dependent (TSD), or genotypic plus temperature effects (GSD+TE). For the fish species with TSD or GSD+TE, extremely high or low temperature can affect its sex determination and differentiation. For long time, the underlying changes in DNA methylation that occur during high or low temperature induced sex reversal have not been fully clarified. In this study, we used Nile tilapia as a model to perform a genome-wide survey of differences in DNA methylation in female and male gonads between control and high temperature induced groups using methylated DNA immunoprecipitation (MeDIP). We identified the high temperature induction-related differentially methylated regions (DMRs), and performed functional enrichment analysis for genes exhibiting DMR. These identified differentially methylated genes were potentially involved in the connection between environmental temperature and sex reversal in Nile tilapia. In this study, four samples (control females, CF; control males, CM; induced females, IF; induced males, IM) were analyzed.

2015-08-27 | E-GEOD-72386 | biostudies-arrayexpress

Global DNA methylation changes in Nile tilapia gonad during high-temperature induced masculinization

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Project description:We report an association of DNA hydroxymethylation profiling at single nucleotide resolution with gene expression in the fast muscle of Nile tilapia.

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Identifying the Interaction of the Brain and the Pituitary in Social- and Reproductive- State of Tilapia by Transcriptome Analyses

Project description:Introduction: reproduction in fish, as in all vertebrates, is regulated by GnRH control on gonadotropic hormones (GTH) activity. However, the neuroendocrine factors that promote GnRH and GTH activity are unknown. In Nile tilapia (Oreochromis niloticus), sexual activity and the ability to reproduce depend on social rank; only dominant males and females reproduce. Here, this characteristic of dominant fish allows us to compare brain and pituitary gene expression in animals that do and do not reproduce, aiming to reveal mechanisms that regulate reproduction. Methods: an extensive transcriptome analysis was performed, combining two sets of transcriptomes: a novel whole-brain and pituitary transcriptome of established dominant males identified by behavioral assays, together with a cell-specific transcriptome of LH and FSH cells. Results: in most dominant fish, as determined behaviorally, the gonadosomatic index (GSI) was higher than in subordinate fish, and the leading upregulated pituitary genes were those coding for GTHs. In the brain, various neuropeptide genes, including oxytocin, cholecystokinin, and MCH, were upregulated; these may be related to reproductive status through effects on behavior and feeding. In a network analysis combining the two transcriptome sets, brain aromatase (cyp19a1b), which is specifically expressed in LH cells, is the most central gene with the highest number of connections. Conclusions: the close correlation between behavioral dominance and reproductive capacity in tilapia allows us to unravel novel genes that may partake in the regulation of the HPG axis, highlighting aromatase as an important factor in integrating the brain and pituitary factors that maintain a sexually active organism.

2022-04-30 | GSE169272 | GEO

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